STY/TEST: Set global style and doctest options

[effigies]

I set skip-string-normalization just to avoid automatic formatters from making unnecessary changes and polluting PRs. Probably not relevant since you've already converted, so I can remove it if you prefer.

[codecov-commenter]

Codecov Report

Merging #162 (6c82415) into master (5db88ae) will decrease coverage by 0.04%.
The diff coverage is 29.16%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
- Coverage   32.58%   32.53%   -0.05%     
==========================================
  Files          44       44              
  Lines        3609     3645      +36     
==========================================
+ Hits         1176     1186      +10     
- Misses       2433     2459      +26     

Impacted Files	Coverage Δ
nibabies/cli/parser.py	2.32% <0.00%> (-0.17%)	⬇️
nibabies/interfaces/confounds.py	58.47% <ø> (ø)
nibabies/interfaces/freesurfer.py	41.53% <ø> (ø)
nibabies/interfaces/multiecho.py	78.57% <ø> (ø)
nibabies/interfaces/workbench.py	88.40% <ø> (ø)
nibabies/utils/bids.py	22.00% <0.00%> (-0.92%)	⬇️
nibabies/utils/confounds.py	3.92% <ø> (ø)
nibabies/workflows/anatomical/base.py	8.69% <0.00%> (-0.20%)	⬇️
nibabies/workflows/base.py	11.11% <ø> (ø)
nibabies/workflows/bold/base.py	13.98% <ø> (ø)
... and 5 more

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[mgxd]

LGTM, much needed